Glossary
Definition. The VAT gap is the difference between the value-added tax that should in theory be collected under the law and the amount tax authorities actually receive. It measures VAT lost to fraud, evasion, avoidance, insolvencies and administrative error.
The VAT gap is the headline measure of how much value-added tax goes missing. It is calculated by estimating the total theoretical VAT liability across the economy, the VAT that would be collected if every liable transaction were declared and paid correctly, and subtracting the VAT actually collected. What remains is the gap. It is usually reported both as an absolute figure and as a percentage of the total theoretical liability.
The European Commission publishes an annual EU-wide estimate. Its VAT Gap Report 2024 put the EU VAT gap at €128 billion for 2023, roughly 9.5% of the VAT that was theoretically due. The number is large enough to reframe the debate: it represents public revenue that was legally owed but never reached the treasury, money that could otherwise fund services or reduce the burden elsewhere.
The gap has many causes. Some is deliberate fraud, most notoriously missing-trader and carousel schemes that exploit the delay between charging VAT and paying it over. Some is ordinary error, and some comes from businesses that collect VAT and then become insolvent before remitting it. Because the causes differ, so do the remedies, but a common thread runs through the modern policy response: shorten the distance in time between the transaction and its verification.
The VAT gap matters here because it is the evidence base for real-time approaches. Continuous transaction controls, real-time reporting and split payment all target the gap by attacking the moment fraud and error take hold. The honest nuance is that no single mechanism closes the gap on its own, estimation carries its own uncertainty, and reducing the gap has to be weighed against the compliance cost and data-protection impact of the measures used to do it.